Crop protection

Levy Communications

June Pest of the Month: Grey mould

At yourlevyatwork.com.au the Pest of the Month June is Grey mould (Botrytis). In this article, they describe the symptoms, what the best conditions are to develop and the host range.  Symptoms include:Blights, spots, blotches, wilts, cankers, rots, damping off and storage diseases. Usually the softer tissues…

June 17, 2020

Learn more on managing Bemisia in poinsettia crops

The non-indigenous tobacco whitefly (Bemisia tabaci) is a serious pest of poinsettia, especially as a late season infestation, when control options are more limited. Following…

Effective IPM using four BioSecure HACCP procedures

Performing a cost benefit analysis on the implementation of Integrated Pest Management (IPM) in production nurseries is one of the objectives of the levy funded project…

Dümmen Orange

"You accept your responsibility, for the product group rose, for the Netherlands ltd"

Start clean, stay clean. This is in a nutshell the strengthened Greencare policy from Dümmen Orange. The necessity is given by the increasing disease pressure and globalisation. Frank Wagenaar: “You take your responsibility, for the product group rose, for the Netherlands ltd. Everything for clean and…

Exploring the use of calcium and BCAs as alternative management strategies for botrytis blight

Botrytis cinerea is the fungal pathogen responsible for Botrytis blight in several crops including commercial cut roses. This disease is usually acquired during the production…

Verano365 launches Nutrivix

New root system improvement product

Verano365 is releasing a new product for greenhouse, nursery and hydroponic growers, which intends to improve the plants root system development.  The product is Nutrivix Zn | CU,…

Biobest

"This highly efficient predator is playing a vital role helping to break the pest lifecycle"

The predator Atheta-System is playing a leading role in preventative and curative control strategies for thrips, sciarid fly (fungus gnats) and shore fly in glasshouse-grown ornamental crops in France. With a voracious appetite, this tiny beneficial rove beetle has become part of multi-pronged strategies…

Biobest to launch Crop-Scanner

New Crop-Scanner app for efficient biological crop protection

The new app Crop-Scanner from Biobest unlocks fast and accurate scouting for growers to deliver improvements in overall IPM performance. Enabling growers and their Biobest advisors to closely follow pest outbreaks in crops online, this innovative app is set to significantly improve the remote provision…

EU Science Hub

Government guidelines

UK: Importing plants that could host Xylella fastidiosa, canker stain of plane and elm yellows

You must follow this guide if you’re bringing certain types of plants into the UK from EU member states and third countries. The rules set out in this guide help prevent the diseases Xylella fastidiosa, Ceratocystis platani (canker stain of plane) and Candidatus Phytoplasma ulmi (elm yellows) coming into…

Koppert Biological Systems

"Keep a close eye on thrips"

Thrips can cause major damage - that's nothing new. This does mean that you need to detect thrips in good time. Sticky traps are a useful tool in monitoring the development of infestations. Regular scouting in the crop is also essential as it allows you to trace the larvae. This increases the chance of successful pest control.…

US (MA): Two-spotted spider mites spotted in greenhouses

Two-spotted spider mites (Tetranychus urticae) have been observed recently, especially on plants in hanging baskets hung high in hot dry areas in the greenhouse. Two-spotted spider mites (TSSM) are a major pest of many greenhouse crops. They feed primarily on the undersides of leaves where they pierce…

Claim ‘insufficiently substantiated’

Pepper grower can wave 500 thousand euro compensation from chrysanthemum neighbour goodbye

Facing a one hundred percent loss, half a year after the start of the pepper cultivation, due to the tomato spotted wilt virus (TSWV). This happened to a pepper grower in the…

"Be familiar with common problems on Rieger begonias"

There are several different but somewhat common problems on Rieger begonia. The three issues we see most often on begonias submitted to Michigan State University Plant & Pest Diagnostics are impatiens necrotic spot virus, bacterial blight (Xanthomonas axonopodis pv. begonia) and broad mites. Each of…

Bioline

"This product saves at least 40% of labour compared to introducing sachets"

James Coles Nurseries in Thurnby, Leicester, is a grower of amenity trees and shrubs in the UK with 7 production locations on 500 acres. James Moffatt, main grower on the Syston production site uses Anderline (Amblyseius andersoni) Gemini sachets, Anderline Bugline and loose product from week 14 to week…

US (WA): WSU scientists enlist citizens in hunt for giant, bee-killing hornet

More than two inches long, the world’s largest hornet carries a painful, sometimes lethal sting and an appetite for honey bees. It is also the newest insect invader of Washington state. The Asian giant hornet, Vespa mandarinia, is unmistakable, said Susan Cobey, bee breeder with Washington State…

US (MA): Downy mildew of impatiens

Downy mildew of impatiens has been observed recently on impatiens in greenhouses in New York and Massachusetts. This disease is caused by the oomycete pathogen Plasmopara obducens. Garden impatiens (Impatiens walleriana), double impatiens or garden balsam (I. balsamina), and the jewelweed species I.…

ICL

UK: Optimising crops now there is light at the end of the tunnel

With Welsh garden centres opening their doors, and English and Scottish centres predicted to follow suit later this week or next, there is finally light at the end of the tunnel for production nurseries, says ICL’s technical area sales manager, Ian Todd. “With many retail outlets having been closed for…

Jan Willem Bakhuijzen:

"Integrated Pest Management gives me peace of mind"

Dutch skimmia grower Jan Willem Bakhuijzen first got acquainted with IPM (Integrated Pest Management) in the 1990s. Now he uses Anderline Bugline and Anderline Gemini sachets. The first introductions of beneficials are made in mid-May at which point the crop starts to close the canopy. The crop cycle…

"Watch for broad mites"

Broad mites (Polyphagotarsonemus latus) have been encountered regularly in spring greenhouse crops over the last few years. The broad mite is a tropical species and does not survive the winter in temperate climates. In northern climates it occurs frequently in greenhouse environments as a result of being introduced with plant…

US (MA): Impatiens downy mildew fungicide program

As noted in the May 4 update, impatiens downy mildew has been observed recently in some Massachusetts greenhouses, particularly on double impatiens. Double impatiens have double rose-like blossoms, and like seed impatiens, they are susceptible to impatiens downy mildew (Plasmopara obducens). Remember to…

CAN (ON): Controlling Japanese beetles

It will soon be that time of year again, when Japanese beetle adults begin to fly. However, the cooler spring means pupation may take longer. So what does that mean for timing of control products? This post answers those questions and provides updated infographics for JB control for those exporting to…

US (NC): Scientists develop spray to help honeybees fight mites

Honeybees pollinate crops from blueberries in Maine to almonds in California and are one of the most important pollinators in North Carolina.  by Allan Maurer As a result, a global decline in honeybee populations during the past few decades has become a serious environmental concern. Now, researchers at the…

"Don’t let downy mildew on impatiens surprise you"

Impatiens are one of the most popular bedding plants for shade gardens worldwide. In 2011, impatiens downy mildew was an unpleasant surprise for greenhouse growers and…

In South Carolina, invasive hornet uproar is much ado about nothing

A two-inch-long insect found dead six months ago on the other side of our continent has become the media’s latest cause celebre. But among the scientists who deal with invasive pests, the bigger problem isn’t the hornet, it’s the hysteria. “The chances that Asian Giant Hornets are in South Carolina are…

Tulip gall mite cannot withstand high temperatures

The dry bulb mite (Aceria tulipae) in tulips can be controlled by storing tulip bulbs for 48 hours at a temperature of 25 °C with low oxygen and high CO2-level. This treatment has no adverse effects on the flower bulbs themselves. These are the major results of research by the Business Unit Greenhouse…

Australia: Two new Minor Use Permits issued

Greenlife Industry Australia (GIA) has been issued the Minor Use Permit for Actinovate biofungicide for the management through suppression of a range of plant pathogens…

Beneficial Insectary

Beneficial Insectary debuts instructional release videos in English and Spanish

Beneficial Insectary’s IPM team has made use of the downtime thanks to COVID-19 by working on digital content for their customers. Over the last year, they have released a series of instructional videos for using their organisms on the Beneficial Insectary YouTube channel. This week, B.I. debuts…

Getting closer to the best environment for plants

Twenty years ago, Forever Plants was one of the first potted plant producers in the Netherlands to switch to integrated plant protection. The grower has experienced first-hand how having the right approach is an important key to success. And in 2020, it is also essential that the entire chain is…

Scouting and troubleshooting plant nutrient problems in cool weather

While the first part of the year has been generally mild, temperatures have been unseasonably cool during the first few weeks of spring. Low ambient and substrate temperatures can lead to slower movement and uptake of water and nutrients, which can cause plants to exhibit symptoms of nutrient deficiency.…

Australia: Managing APPS and Biosecurity Programs during COVID-19

Greenlife Industry Australia (GIA) has been very active in the national discussions across multiple issues affecting industry due to the COVID-19 response as well as…

How to keep your retail plants pest and disease free?

To keep your retail nursery’s plants pest and disease free, and therefore at their most attractive and saleable, Steve Blyth, Greenlife Industry Australia’s Biosecurity Certification Officer provides some practical tips and resources. by Gabrielle Stannus   “It used to be drummed into us when we had our little retail nursery…

UK growers seek alternative ways to control vine weevil as Exemptor is phased out

With the recent revocation of the licence for Thiacloprid, last dates for ordering Exemptor – the systemic season long vine weevil control, have been announced. The final date for sales of Exemptor to UK growers for stand-alone product, or to place orders for incorporation into growing media, is 3…

Xylella: 37 new plant species added to host list

Thirty-seven new plant species have been identified as hosts of the Xylella fastidiosa pathogen. Most were naturally (not artificially) infected and were found both in EU countries (France, Italy, Portugal and Spain) and non-EU countries (USA and Iran). The new hosts include common ornamental, wild and…

HRI

webinar, April 29

Ralstonia: What you need to know

Ralstonia solancearum race 3 biovar 2 (R3B2), a federal quarantine pest, was recently confirmed in a single geranium variety in a greenhouse in Michigan, the first confirmed case in the US since 2004. Diseased geraniums planted in the landscape can potentially infect other plants, including tomatoes, potatoes, peppers, and…

Maintaining quality of plants in retail spaces

When plants are moved to retail areas, the hope is that turnover will be quick and plants will be in the retail space for a short period of time. Due to the current COVID-19 pandemic, plants may remain in retail spaces for longer than expected. To maintain quality of plants and keep them looking their…

US (MA): Common plant viruses may be afoot

For those unfamiliar with plant viruses, the names assigned to them can be misleading, as a virus’ host range is sometimes broad and the symptoms produced can be variable. Traditionally, plant viruses are named for the first host plant they are identified in association with and the predominant symptom…

Debalina Saha

US (MI): Weed management strategies in greenhouses

Weeds are a persistent problem in greenhouses, hoop houses, propagation houses and other enclosed structures. Hairy bittercress (Cardamine hirsuta), yellow woodsorrel (Oxalis stricta), spotted spurge (Euphorbia maculata) and liverwort (Marchantia polymorpha) are some of the most common weeds that are…

Growers deploy nematodes to defeat vine weevil

With the EU ban on thiacloprid products such as Exemptor, Biscaya, Calypso, growers are increasingly turning to beneficial nematode control in their fight against black vine weevil (Otiorhynchus sulcatus).  Uniquely offering both contact and systemic action, many growers were heavily reliant on thiacloprid…

USDA finds Ralstonia solanacearum race 3 biovar 2 in geranium plants

Ball FloraPlant recently received notification of a positive test result for Ralstonia solanacearum race 3 biovar 2 on Geranium Fantasia Pink Flare. The samples were sent from…

Dutch anthurium breeder does everything possible against aphids

In some cases, customers at home and abroad have to work with products from Anthura for as many as 30 weeks before they go to the end market. It is therefore extremely important that the product they receive is healthy and clean. Aphid control is becoming more difficult, and Anthura is currently devoting…

Robert S. Emmitt, Agdia, Inc.

Diagnosing orchid viruses: Identifying the suspects, protecting your investments

Orchids are treasured by their dedicated patrons for beauty, novelty and longevity. Many collections culminate in decades of financial, temporal and emotional investments. Moreover, big-box retail outlets and garden centers have introduced novices to these unique plants by making orchid culture available…

OHP adds Grotto Fungicide to biosolutions portfolio

OHP announces the addition of Grotto Fungicide/Bactericide to its stable of pest control solutions for the ornamental industry. Available immediately, Grotto is a high-quality copper octanoate, broad-spectrum fungicide that has activity on many greenhouse and nursery fungal and bacterial diseases.…

How to deal with snapdragon rust

Snapdragons remain a popular bedding plant and one of the most popular cut flower crops for growers selling directly to local wholesale and retail florists. While there are several pests and diseases that can adversely impact this crop, some growers have been seeing snapdragon rust in their greenhouses and high tunnels this…

US (MA): Weather and botrytis in the greenhouse

Since it appears that the weather will shift back to the cool and rainy side over the next couple of days, it’s an opportune time to think about botrytis. by Angela Madeiras, Extension Educator and Diagnostician, UMass Extension Plant Diagnostic Lab with Jim Mussoni, Private IPM Scout Botrytis was…

How to identify and manage yellow woodsorrel in nurseries and greenhouses

Container-grown ornamentals need to be weed-free as weed competition can reduce the overall growth and market value of the ornamentals, and for aesthetics. Oxalis (Oxalis stricta), also known as yellow woodsorrel, is one of the most common broadleaf weed species in container nurseries and greenhouses in…

Fusarium on Echeveria

What do you write an e-Gro Alert on when your state is under a stay-at-home order due to COVID-19, and you have been stuck under quarantine because a co-worker tested positive? You write about your houseplants! by Nora Catlin (nora.catlin@cornell.edu) While in my living room, now office, I happened to glance over at an…

Slowing spring slug activity to a snail’s pace

Slugs (and snails) are an occasional pest in ornamental and edible greenhouse crops as they thrive in damp, humid environments – ideal conditions found in production and retail settings. Extended wet periods this spring across the Midwest have contributed to enhanced slug activity. by Beth Scheckelhoff…

US (MI): Be on the lookout for a new pigweed species, purple amaranth

Purple amaranth (Amaranthus blitum L.), also known as livid amaranth, was identified for the first time in March 2019 in an ornamental greenhouse specimen planted in soilless media sent into Michigan State University Plant & Pest Diagnostics for other analysis. In August 2019, it was again identified in…

CAN (ON): Pesticide safety certifications extended

As a preventative measure to minimize the spread of COVID-19, the Ontario Pesticide Education Program cancelled all classroom Grower Pesticide Safety Courses and Pesticide…

Mildew 101: Powdery vs. Downy

What’s in a name? A lot, it turns out, when it comes to powdery and downy mildews. Though the common names of these two diseases sound similar, the organisms that cause them are actually very different from each other. Powdery mildews are caused by a large group of true fungi. Spores germinate and directly penetrate the…

Which pathogens should you worry about in your water?

When it comes to talking about disease-related issues in greenhouse crops, one point of confusion is often over which pathogens can be transmitted by water. Some are obvious – we all know Pythium is water-borne. But what about other culprits, like Fusarium or Erwinia? Should you worry about these in your…

Halving finds in rose, doubling in citrus

NL: Less False codling moth found by KCB in 2019

In 2019, the Kwaliteits Controle Bureau (Quality Check Bureau, KCB), found False codling moth 127 times during phytosanitary import inspections. That's a decrease, compared to…

UK & Ireland

New biorational targets vine weevil eggs & early instars

Pitcher GR - a new biorational for the suppression of Black Vine Weevil eggs and early instar larval stages - is being hailed as a timely new tool in the IPM armoury for controlling this problematic pest. Developed by independent UK-based biopesticide company Ecospray, Pitcher GR is available exclusively…

Spring brings insect pests

This week in the greenhouse brings upon us the start of aphid season. Green peach aphids (Myzus persicae) were detected on calibrachoa, fuchsia, and pansy. If you are using biocontrol agents (BCAs) for aphid management, deployment should have begun by this point in the season. BCAs such as Aphidius colemani and A. matricariae…

US (MI): Recommendations for Botrytis fungicides for 2020

The greenhouse environment provides ideal growing conditions for both plants and plant pathogens. The high relative humidity and lack of air circulation often found beneath the plant canopy are especially ideal for the pathogen Botrytis cinerea, commonly called gray mold. This pathogen infects many…

How teamwork improves pest management

Clever biological control methods and new targeted chemicals combine to make pest management more effective, but getting your team on board makes it even more successful. Dan Foster, Sigler Site Manager and Product Line Manager, and Andrew Luxon, IPM Supervisor share the details of Four Star’s pest…

5 tips on how to get the answers you need

Diagnostics from a distance

How do you get help in this day and age when your extension agent or consultant can’t just pop into your greenhouse and look at a problem with you? Although nothing can replace seeing an issue first-hand, there is still a way to get help with your pest and production issues from a distance. This post will give you tips on key…

NMSU determining combination of native flowers to attract different pollinators

Pollinator insects play a critical role in the agricultural world. Without their natural transference of pollen from plant to plant while obtaining nutrients, many types of vegetables and fruit for human consumption would not exist. New Mexico State University’s Agricultural Science Center at Los Lunas…

Preventing and controlling white mold (Sclerotinia) during greenhouse crop production

Sclerotinia can infect many ornamental greenhouse and vegetable crops with symptoms including damping off, blighting, and stem rot. To diagnose, inspect plants for white cottony growth; for small, hard, black sclerotia on or in plant tissue; or submit plant samples to your preferred diagnostic lab. This…

US (MA): More insects spotted in the greenhouse

Based on greenhouse monitoring in the past week, UMass Extension's Greenhouse Crops and Floriculture Team with Jim Mussoni, Private IPM Scout, report the following: Twospotted…

Australia: Fall armyworm detections rise

The Fall armyworm (Spodoptera frugiperda) has now been detected in the North Queensland regions of Ayr, Home Hill, further south in Bowen and in Katherine, Northern Territory. This brings the total number of confirmed detections to nine since the first identification of Fall armyworm on mainland…

What is wrong with my hosta? It might not be Hosta virus X

Hostas are indispensable components of shade gardens throughout the United States. Consequently, they have become one of the most economically important herbaceous perennials for horticulturalists, hybridizers and hobbyists. Much of this plant’s popularity is due to the fact it is relatively free of…

US: APHIS takes step to sow possible Boxwood Tree Moth introduction

There is good news from the Animal and Plant Health Inspections Service (APHIS) this month. APHIS has approved the federal order restricting the importation of Buxus, Euonymous, and Ilex from Canada, in an effort to reduce the possibility of introduction of the Boxwood Tree Moth to the United States.…

Hibiscus-infecting cilevirus in Florida

Hibiscus is an economically important plant of Florida’s ornamental industry. Florida is the largest producer of Hibiscus rosasinensis Linn, the Chinese hibiscus or China rose, and produces 91 percent of the total U.S. market (USDA-CHS, 2014). Hibiscus-infecting cilevirus (HiCV) was first described in H.…


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